Nucleoside triphosphates exist in a cell as complexes with A)Phosphate ion. B)Mg²+ only. C)Mg³+ only. D)Mg²+ and sometimes Mn²+. E)All of the above.

Question

Quizplus · Accepted Answer

Nucleoside triphosphates typically exist in a cell as complexes with divalent metal ions such as Mg²+ or Mn²+. These metal ions help to stabilize the negative charges on the phosphates and facilitate phosphodiester bond formation in DNA and RNA synthesis. However, they do not exist as complexes with phosphate ions or Mg³+, so options A and C can be ruled out. Option E is incorrect as it includes option B, which is not a correct answer. Therefore, the best choice is D.

Nucleoside Triphosphates Exist in a Cell as Complexes with